Using Ryzen 5 2xxxG together with other video card

First of all, thank you for your long running AM4 platform. For me it's an interesting platform I'm going to move to.

I am going to move to Ryzen 5 from my current old Intel Core platform and I'm going to make continuous-in-time upgrade. So, I want buy a Ryzen 5 2400G and buy a separate video card some time later. The question is: will I have any possibility to use a Ryzen 5 2400G built-in GPU together with some of the mid-range GPU-cards (maybe Radeon RX 580 or other vendor videocards ) or I will have to only turn off my RX Vega 11 GPU (and stay with just 4-cores CPU)?

Maybe there are some future plans to use RX Vega 11 like additional PhisX or any other support for the main separate graphic card?